What method is used to estimate OT distance?

The method used to estimate the OT (Target) distance through map spot and eyeballing is effective because it combines the use of visual observation with map reading skills. Map spot involves identifying the target location on a map and using known terrain features to gauge distances. Eyeballing, or visually estimating distances based on familiar landmarks or terrain elements, serves to augment the accuracy of the map reading. This method is particularly useful in situations where high-tech devices like GPS and laser rangefinders are unavailable or impractical, making it a fundamental skill for Marines in the field.

Using GPS readings tends to depend on electronic devices that may not always be reliable, particularly in varied terrain or in cases of equipment failure. Although a laser rangefinder provides precise measurements, reliance on such technology can be limited by factors such as visibility or device malfunction. Cardinal direction estimation involves gauging direction but does not directly provide distance measurements, making it less effective in determining the precise OT distance compared to the combination of map spot and eyeballing, which offers a more holistic approach.